﻿//
// Copyright (c) 2011 Canyala Innovation AB
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
// associated documentation files (the "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
// copies of the Software, and to permit persons to whom the Software is furnished to do so, 
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT 
// NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH 
// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
//

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Text.RegularExpressions;

namespace Canyala.Lagoon.Expressions
{
    public class Compiler
    {
        static public double Evaluate(string expression, Symbols symbols = null)
        {
            if (symbols == null)
                symbols = new Symbols();

            Parser parser = new Parser(expression, symbols);
            Expression<Func<double>> lambdaExpression = Expression.Lambda<Func<double>>(parser.ExpressionTree);
            Func<double> compiledExpression = lambdaExpression.Compile();
            return compiledExpression();
        }

        public Compiler(string expression, Symbols symbols = null)
        {
            if (symbols == null)
                symbols = new Symbols();

            Symbols = symbols;
            Parser parser = new Parser(expression, symbols);
            Expression<Func<double>> lambdaExpression = Expression.Lambda<Func<double>>(parser.ExpressionTree);
            compiledExpression = lambdaExpression.Compile();
        }

        public double Value { get { return compiledExpression(); } }
        public Symbols Symbols { get; set; }

        private Func<double> compiledExpression;
    }
}

